[c-nsp] IOS XR 3.6.0 BGP next-hop to null 0 bug?

[Oliver Boehmer (oboehmer)]

Zhang Huanjie <> wrote on Monday, July 14, 2008 4:35 PM:

> I am writing a simple bgp client and want use this client to send
> blacklist prefix to router. My goal it to add and remove blackhole
> routes automatically. 
> 
[...]
> 
> 
> While sending updates to a GSR 12404 running IOS XR 3.6.0, it seems
> the router treate 192.0.2.1 always
> as inaccessible. None of the prefix is add to FIB. Here is the show:
> 
> #show bgp 192.168.100.1
> BGP routing table entry for 192.168.100.1/32
> Versions:
>   Process           bRIB/RIB  SendTblVer
>   Speaker                  0           0
> Paths: (1 available, no best path)
>   Not advertised to any peer
>   Path #1: Received by speaker 0
>   Local
>     192.0.2.1 (inaccessible) from x.x.x.x (x.x.x.x)
>       Origin IGP, metric 20, localpref 100, valid, internal
> [..] 
> Is this a bug of IOS XR?

yes, this is a bug in XR3.5/3.6.0, documented in CSCsm76283 (Umbrella
fix for Remote Trigger Blackhole and a BGP CLI output issue). SMUs
should be available..

	oli